bleed valve

noun

1. a valve for running off a liquid from a tank, tube, etc, or for allowing accumulations of gas in a liquid to blow off Also calledbleed nipple

Example Sentences

On a hot-water unit, let the air out through the bleed valve, a square nut located near the top of the unit.

From Time

Other kids say the opposite--that their emotional turmoil is so great that they need something to serve as a bleed valve to calm them down in times of crisis.

From Time Magazine Archive